Abdullah ibn Mas’ud reported: The Messenger of Allah, peace and blessings be upon him, said during his farewell sermon, “Which month do you know has the greatest sanctity?” They said, “No doubt, this month of ours, Dhul Hijjah.” The Prophet said, “Which city do you know has the greatest sanctity?” They said, “No doubt, this city of ours, Mecca.” The Prophet said, “Which day do you know has the greatest sanctity?” They said, “No doubt, this day of ours, ‘Arafat.” The Prophet said, “Verily, Allah Almighty has sanctified your lives, your wealth, and your honor, except by right of justice, like the sanctity of this day of yours, in this city of yours, in this month of yours. Have I not delivered the message?” The Prophet said all of that three times and they said, “No doubt, yes.” The Prophet said, “Be warned! Do not turn back to unbelief after me by striking the necks of each other.”